EP0029769B1 - Carburettor comprising a choke valve - Google Patents

Carburettor comprising a choke valve Download PDF

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Publication number
EP0029769B1
EP0029769B1 EP19800401604 EP80401604A EP0029769B1 EP 0029769 B1 EP0029769 B1 EP 0029769B1 EP 19800401604 EP19800401604 EP 19800401604 EP 80401604 A EP80401604 A EP 80401604A EP 0029769 B1 EP0029769 B1 EP 0029769B1
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EP
European Patent Office
Prior art keywords
carburetor
flap
pneumatic means
chamber
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800401604
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German (de)
French (fr)
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EP0029769A1 (en
Inventor
Gaston Arnaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Industrielle de Brevets et dEtudes SIBE
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Societe Industrielle de Brevets et dEtudes SIBE
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Publication of EP0029769A1 publication Critical patent/EP0029769A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat

Definitions

  • the invention relates to carburetors of the type which include: a starting device with an eccentric flap situated in the air inlet of the carburetor, upstream of the outlet of a system for introducing the primary air mixture and fuel, shutter actuated by the air stream drawn in by the carburetor against the action of a first thermostatic member which tends to close the shutter when a temperature is below a given limit; an accelerated idle cam adapted to cooperate with a second thermostatic member and intended to open the throttle member controlled by the driver when the starting flap is closed, at least partially; pneumatic means sensitive to the depression which prevails in the intake duct of the carburetor and which control, by their movement, the opening of the shutter when the said depression increases; and stop means with several positions, sensitive to the ambient temperature and which limit, in a variable manner as a function of the position which they occupy, the displacement of the pneumatic means.
  • Such a carburetor is described and claimed in patent FR-A-2 194 234.
  • the stop means at several positions consist of steps of a stepped rotary cam whose angular position is controlled by means sensitive to ambient temperature and which also constitutes an accelerated idle cam.
  • the pneumatic means generally consist of a membrane capsule linked to a rod whose movements control the opening of the shutter, provided with an arm carrying an adjustable stop capable of cooperating with the steps.
  • the stop means the position of the flap immediately after departure is precisely adjusted as a function of the ambient temperature. Consequently, an enrichment of the air / fuel mixture is obtained, at accelerated idle, which can be low when the ambient temperature reaches at least 20 ° C., without compromising the smooth running at low temperature since the enrichment is then higher. .
  • the pneumatic means are connected downstream of the throttle member, operation may not be satisfactory under the following conditions: if a long period of time elapses after starting the cold engine without that the throttle valve is wide open (which can happen in city traffic, for example) the depression exerted on the pneumatic means remains sufficiently large to keep these means in abutment on the stop means against the action of the return spring planned to oppose this support.
  • the friction between the pneumatic means and the abutment means can be high enough to prevent the cam from turning during the reheating of the engine, all the more so since this reheating acts through a thermostatic member which is generally a bimetallic strip which can exert only a limited torque on the rotary cam.
  • the abutment means can remain blocked in a position which corresponds to a cooler engine. The air / fuel mixture supplied to the engine then becomes too rich.
  • the carburetor described in patent application FR-A-2 391 367 comprises pneumatic means comprising, in addition to a first return spring acting permanently, a second return spring which increases the force as a reminder when the stroke of the pneumatic means, under the action of the vacuum prevailing in the intake duct, exceeds a amplitude determined from their rest position; it is thus easier to obtain the clearance of the stepped rotary cam than before.
  • pneumatic means comprising, in addition to a first return spring acting permanently, a second return spring which increases the force as a reminder when the stroke of the pneumatic means, under the action of the vacuum prevailing in the intake duct, exceeds a amplitude determined from their rest position; it is thus easier to obtain the clearance of the stepped rotary cam than before.
  • there remains the need to open the main throttling member notably to release the abutment means.
  • the present invention aims to provide a carburetor in which the abutment means are liberated by a small opening of the throttle member, without that the effect of the pneumatic means on the opening of the shutter is lost.
  • the invention provides a carburetor in which the pneumatic means comprise two movable walls coupled to one another by a bidirectional connection comprising a determined clearance, the first of which, which cooperates directly with the stop means, is active when the throttle does not exceed the idle position and the second is active when the throttle exceeds this position.
  • the pneumatic means must be provided with elastic return means which are advantageously of the type described in patent application FR-A-2 391 367, the first spring cooperating with the second movable wall.
  • the two movable walls delimit a chamber connected to a point of the intake duct situated immediately downstream of the location occupied by the edge of the choke member ment when the latter is in the accelerated idle position corresponding to the lowest temperature for which the carburetor is provided.
  • the first wall can thus be subjected to the difference between the atmospheric pressure and the pressure in the chamber, the sedonde to the difference between the pressure in the chamber and the pressure at a point of the intake duct located permanently downstream of the throttling organ.
  • the description refers to the single figure which accompanies it and shows, in schematic section, the starting system of a carburetor according to the invention, the various elements being in the position which they occupy when the engine is running at accelerated idle. , at a temperature which is not the lowest of those for which it is intended.
  • the carburetor shown of the inverted type, has a general constitution similar to that described in patent publication FR 2 391 367 to which reference may be made. It comprises an intake duct 1 provided with an air inlet 2 and with a conventional system for introducing the primary mixture (not shown).
  • the starting device comprises an eccentric flap 3 mounted on an axis 4, upstream of said system (the direction of circulation being indicated by an arrow), and actuated by the current of air sucked in by the carburetor against the action of a first thermostatic member 5 which tends to close the shutter when the temperature of an element which heats up at the same time as the motor is below a given limit.
  • the member 5 may be provided so as to no longer exert appreciable forces on the shutter in the closing direction as soon as the temperature of the engine cooling water exceeds 65 ° C.
  • This organ is generally a bimetallic spiral, which can exert only a weak effort.
  • the usual throttling member 6 of the carburetor is constituted by a butterfly mounted on an axis 7 downstream of the introduction system and actuated by the driver.
  • the throttle member 6 returns to its minimum open position, determined by an accelerated idle cam 8.
  • the cam 8 shown is provided with steps 8a d support of an adjustable stop screw 10, carried by a lever 11 fixed on the rotary axis 12 and connected by a rod 13 to a lever 14 secured to the axis 7 of the butterfly 6.
  • the cam 8 rotates freely on a fixed socket (not visible in the figure) inside which a pin 16 passes freely.
  • the socket is fitted in a housing containing the first thermostatic member 5 and closed by a cover supporting an electrical resistance connected to the ignition circuit of the engine so as to heat the thermostatic member 5 as soon as the engine is running.
  • the thermostatic member 5 can be heated by any other means, such as for example the engine cooling water.
  • the end of the axis 16 located in the housing is fixed to a lever 20 bent at its ends 20a and 20b in the direction of the axis 16.
  • the end 20a constitutes a finger to which the movable end of the thermostatic element 5 and will be driven by this end.
  • a lever 22 is fixed by a nut 21 at the other end of the axis 16, distant from the lever 20.
  • the lever 22 is connected by a rod 23 to a lever 24 secured to the axis 4 of the shutter 3.
  • a second thermostatic member 9 is also constituted by a bimetallic spiral, the external end 9a of which is wound around a lug 25 integral with the cam 8. This end 9a is thus anchored on the cam 8 and drives this cam in the direction of clockwise rotation when the member 9 cools, in the opposite direction when it heats.
  • the internal end of the bimetallic spiral 9 is fixed on the axis 16 integral with the lever 20.
  • the lever 22 has a finger 27 which can cooperate by abutment with the lug 25 of the cam 8 to limit the angular movement that the second thermostatic member 9 tends to impose on the cam 8 when its temperature decreases.
  • the lever 11 has one end 11 a bent perpendicular to the plane of the assembly of the lever 11. This end 11 a is adapted to cooperate by abutment with a part 22a of the lever 22. When the driver opens the throttle member or butterfly 6, the lever 11 rotates clockwise around the axis 12 and its end 11 abuts against the part 22a and imposes a minimum opening on the flap 3.
  • Pneumatic means provided for controlling the opening of the shutter 3 when the vacuum in the intake duct 1 increases, comprise a pneumatic element D provided with a rod 34.
  • the rod 34 has a notch e limited, on the side remote from the element D, by an edge 34a perpendicular to the longitudinal direction of the rod 34.
  • the end 20b of the lever 20 is housed in the notch e so that the edge 34a can cooperate by abutment with this end 20b.
  • the end 34b of the rod 34 carries a screw 36 serving as an adjustable stop, suitable for cooperating via its terminal part 36a with the steps 8b of the cam 8 to limit the controlled opening of the shutter 3.
  • This spring 40 surrounds a part 41 of the rod 34 of reduced diameter relative to the rest of the rod; it is precompressed between, on the one hand, the end 34b of the rod 34 and, on the other hand, an annular support piece 42 which can slide along the cylindrical part 41 of the rod 34 and which it tends to apply against a shoulder 44 of said rod 34.
  • the ring 42 has an external diameter greater than the largest dimension of a passage formed to accommodate the rod 34 inside a boss of the carburetor body.
  • the pneumatic element D of the carburetor shown in the figure comprises two movable walls constituted by membranes 51 and 56 placed in a housing 50.
  • the first membrane 51 is directly coupled to the rod 34.
  • This membrane 51 separates a chamber 52, maintained at atmospheric pressure, from a chamber 53 connected, by a channel 54, to an orifice 55 opening into the conduit 1 at a point which passes from downstream to upstream of the edge of the throttle valve 6 when the latter is opened from its accelerated idle position.
  • This point could be placed immediately downstream of the position taken by the butterfly 6 when the screw 36 rests on the highest step 8b of the cam 8.
  • the pneumatic element D makes it possible to maintain a pneumatic assistance for opening the shutter 3 when this position is exceeded.
  • the second membrane 56 separates the chamber 53 from a chamber 57 connected to a point 58 of the conduit 1 located permanently downstream of the butterfly 6, by a channel 59. It is linked to the membrane 51 by a mechanical connection having a clearance j .
  • the illustrated link is constituted by a rod 60 coupled to the membrane 56 and whose open end 61 is held inside a stirrup 62 secured to the membrane 51, stirrup in which it can move between two stop positions 63 and 64.
  • the clearance j is given the lowest possible value for which the duration of release of the cam 8, when the throttle 6 is opened from idle to a partially open position is sufficient for this cam takes an equilibrium position under the action of the bimetallic spiral 5. This clearance j will depend to a certain extent on the volume of the chamber 53 and on the passage section offered by the conduit 54. It will not exceed 1 mm in general; its value will typically be a few tenths of a millimeter.
  • a spring 65 disposed in the chamber 57 tends to push the membrane 56 to the left of the figure.
  • the membrane 51 subjected on one side to atmospheric pressure and on the other face to the depression prevailing in the conduit 1 downstream of the butterfly 6, pulls the rod 34 to the right of the figure, thus maintaining the part terminal 36a of the screw 36 in abutment on a step 8b of the cam 8, against the force of the spring 40; the open end portion 61 of the rod 60 is held in abutment on the abutment face 63 inside the stirrup 62, by the force of the spring 65, of stiffness much less than the stiffness of the spring 40.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Description

L'invention est relative aux carburateurs du genre de ceux qui comprennent: un dispositif de départ à volet excentré situé dans l'entrée d'air du carburateur, en amont du débouché d'un système d'introduction du mélange primaire d'air et de combustible, volet actionné par le courant d'air aspiré par le carburateur contre l'action d'un premier organe thermostatique qui tend à fermer le volet quand une température est inférieure à une limite donnée; une came de ralenti accéléré propre à coopérer avec un second organe thermostatique et destinée à entrouvrir l'organe d'étranglement commandé par le conducteur quand le volet de départ est fermé, au moins partiellement; des moyens pneumatiques sensibles à la dépression qui règne dans le conduit d'admission du carburateur et qui commandent, par leur déplacement, l'ouverture du volet lorsque la susdite dépression augmente; et des moyens de butée à plusieurs positions, sensibles à la température ambiante et qui limitent, de manière variable en fonction de la position qu'ils occupent, le déplacement des moyens pneumatiques.The invention relates to carburetors of the type which include: a starting device with an eccentric flap situated in the air inlet of the carburetor, upstream of the outlet of a system for introducing the primary air mixture and fuel, shutter actuated by the air stream drawn in by the carburetor against the action of a first thermostatic member which tends to close the shutter when a temperature is below a given limit; an accelerated idle cam adapted to cooperate with a second thermostatic member and intended to open the throttle member controlled by the driver when the starting flap is closed, at least partially; pneumatic means sensitive to the depression which prevails in the intake duct of the carburetor and which control, by their movement, the opening of the shutter when the said depression increases; and stop means with several positions, sensitive to the ambient temperature and which limit, in a variable manner as a function of the position which they occupy, the displacement of the pneumatic means.

Un tel carburateur est décrit et revendiqué dans le brevet FR-A-2 194 234. Les moyens de butée à plusieurs positions sont constitués par des gradins d'un came rotative étagée dont la position angulaire est commandée par les moyens sensibles à la température ambiante et qui constitue également came de ralenti accéléré.Such a carburetor is described and claimed in patent FR-A-2 194 234. The stop means at several positions consist of steps of a stepped rotary cam whose angular position is controlled by means sensitive to ambient temperature and which also constitutes an accelerated idle cam.

Les moyens pneumatiques sont généralement constitués par une capsule à membrane liée à une tige dont les déplacements commandent l'ouverture du volet, munie d'un bras portant une butée réglable propre à coopérer avec les gradins.The pneumatic means generally consist of a membrane capsule linked to a rod whose movements control the opening of the shutter, provided with an arm carrying an adjustable stop capable of cooperating with the steps.

Grâce aux moyens de butée, la position du volet aussitôt après le départ est réglée de façon précise en fonction de la température ambiante. En conséquence, on obtient un enrichissement du mélange air/combustible, au ralenti accéléré, qui peut être faible lorsque la température ambiante atteint au moins 20° C, sans pour autant compromettre la bonne marche à basse température puisque l'enrichissement est alors polus élevé.Thanks to the stop means, the position of the flap immediately after departure is precisely adjusted as a function of the ambient temperature. Consequently, an enrichment of the air / fuel mixture is obtained, at accelerated idle, which can be low when the ambient temperature reaches at least 20 ° C., without compromising the smooth running at low temperature since the enrichment is then higher. .

Si les moyens pneumatiques sont reliés à l'aval de l'organe d'étranglement, le fonctionnement peut ne pas être satisfaisant dans les conditions suivantes: s'il s'écoule, après un démarrage du moteur froid, une période de temps longue sans que le papillon soit largement ouvert (ce qui peut arriver en circulation urbaine, par exemple) la dépression qui s'exerce sur les moyens pneumatiques reste suffisamment importante pour maintenir ces moyens en appui sur les moyens de butée contre l'action du ressort de rappel prévu pour s'opposer à cet appui. Le frottement entre les moyens pneumatiques et les moyens de butée peut être suffisamment élevé pour empêcher la came de tourner au cours du réchauffage du moteur, d'autant plus que ce réchauffage agit par l'intermédiaire d'un organe thermostatique qui est en général une bilame qui ne peut exercer qu'un couple limité sur la came rotative. Ainsi, malgré le réchauffage de la bilame qui accompagne celui du moteur, les moyens de butée peuvent rester bloqués dans une position qui correspond à un moteur plus froid. Le mélange air/combustible fourni au moteur devient alors trop riche.If the pneumatic means are connected downstream of the throttle member, operation may not be satisfactory under the following conditions: if a long period of time elapses after starting the cold engine without that the throttle valve is wide open (which can happen in city traffic, for example) the depression exerted on the pneumatic means remains sufficiently large to keep these means in abutment on the stop means against the action of the return spring planned to oppose this support. The friction between the pneumatic means and the abutment means can be high enough to prevent the cam from turning during the reheating of the engine, all the more so since this reheating acts through a thermostatic member which is generally a bimetallic strip which can exert only a limited torque on the rotary cam. Thus, despite the heating of the bimetallic strip which accompanies that of the engine, the abutment means can remain blocked in a position which corresponds to a cooler engine. The air / fuel mixture supplied to the engine then becomes too rich.

Ce défaut n'est qu'atténué si on relie les moyens pneumatiques à un point du conduit d'admission qui passe d'aval en amont de l'organe d'étranglement lorsqu'on entr'ouvre ce dernier. Il faut en effet placer ce point assez loin de la position de repos pour éviter que la moindre ouverture de l'organe d'étranglement principal n'entraîne l'annulation de l'effet des moyens pneumatiques et, par conséquent, la fermeture du volet de départ.This defect is only mitigated if the pneumatic means are connected to a point of the intake duct which passes from downstream to upstream of the throttle member when the latter is opened. It is indeed necessary to place this point far enough from the rest position to prevent the slightest opening of the main throttling member from causing the cancellation of the effect of the pneumatic means and, consequently, the closing of the shutter. of departure.

Pour résoudre le problème, le carburateur décrit dans la demande de brevet FR-A-2 391 367, comprend des moyens pneumatiques comportant, en plus d'un premier ressort de rappel agissant en permanence, un second ressort de rappel qui augmente l'effort de rappel lorsque la course des moyens pneumatiques, sous l'action de la dépression qui règne dans le conduit d'admission, dépasse une amplitude déterminée à partir de leur position de repos; on peut ainsi obtenir plus facilement qu'auparavant le dégagement de la came rotative étagée. Il subsiste toutefois la nécessité d'entr'ouvrir notablement l'organe d'étranglement principal pour dégager les moyens de butée.To solve the problem, the carburetor described in patent application FR-A-2 391 367, comprises pneumatic means comprising, in addition to a first return spring acting permanently, a second return spring which increases the force as a reminder when the stroke of the pneumatic means, under the action of the vacuum prevailing in the intake duct, exceeds a amplitude determined from their rest position; it is thus easier to obtain the clearance of the stepped rotary cam than before. However, there remains the need to open the main throttling member notably to release the abutment means.

La présente invention vise à fournir un carburateur dans lequel les moyens de butée sont lib+erés par une faible ouverture de l'organe d'étranglement, sans pour cela que l'effet des moyens pneumatiques sur l'ouverture du volet soit perdu.The present invention aims to provide a carburetor in which the abutment means are liberated by a small opening of the throttle member, without that the effect of the pneumatic means on the opening of the shutter is lost.

Dans ce but, l'invention propose un carburateur dans lequel les moyens pneumatiques comprennent deux parois mobiles attelées l'une à l'autre par une liaison bidirectionnelle comportant un jeu déterminé, dont la première, qui coopère directement avec les moyens de butée, est active lorsque l'organe d'étranglement ne dépasse pas la position de ralenti et la seconde est active lorsque l'organe d'étranglement dépasse cette position.To this end, the invention provides a carburetor in which the pneumatic means comprise two movable walls coupled to one another by a bidirectional connection comprising a determined clearance, the first of which, which cooperates directly with the stop means, is active when the throttle does not exceed the idle position and the second is active when the throttle exceeds this position.

Les moyens pneumatiques doivent être munis de moyens élastiques de rappel qui sont avantageusement du type décrit dans la demande de brevet FR-A-2 391 367, le premier ressort coopérant avec la seconde paroi mobile.The pneumatic means must be provided with elastic return means which are advantageously of the type described in patent application FR-A-2 391 367, the first spring cooperating with the second movable wall.

Pour obtenir la succession d'effets, il suffit que les deux parois mobiles délimitent une chambre reliée à un point du conduit d'admission situé immédiatement en aval de l'emplacement occupé par la tranche de l'organe d'étranglement lorsque celui-ci est dans la position de ralenti accéléré correspondant à la température la plus basse pour laquelle est prévu le carburateur. La première paroi peut ainsi être soumise à la différence entre la pression atmosphérique et la pression dans la chambre, la sedonde à la différence entre la pression dans la chambre et la pression en un point du conduit d'admission situé en permanence en aval de l'organe d'étranglement.To obtain the succession of effects, it suffices that the two movable walls delimit a chamber connected to a point of the intake duct situated immediately downstream of the location occupied by the edge of the choke member ment when the latter is in the accelerated idle position corresponding to the lowest temperature for which the carburetor is provided. The first wall can thus be subjected to the difference between the atmospheric pressure and the pressure in the chamber, the sedonde to the difference between the pressure in the chamber and the pressure at a point of the intake duct located permanently downstream of the throttling organ.

L'invention sera mieux comprise à la lecture de la description qui suit d'un carburateur suivant un mode particulier de réalisation de l'invention, donné à titre d'exemple non limitatif.The invention will be better understood on reading the following description of a carburetor according to a particular embodiment of the invention, given by way of non-limiting example.

La description se réfère à la figure unique qui l'accompagne et montre, en coupe schématique, le système de départ d'un carburateur suivant l'invention, les différents éléments étant dans la position qu'ils occupent lorsque le moteur tourne au ralenti accéléré, à une température qui n'est pas la plus basse de celles pour lesquelles il est prévu.The description refers to the single figure which accompanies it and shows, in schematic section, the starting system of a carburetor according to the invention, the various elements being in the position which they occupy when the engine is running at accelerated idle. , at a temperature which is not the lowest of those for which it is intended.

Le carburateur représenté, de type inversé, a une constitution générale similaire à celle décrite dans la publication de brevet FR 2 391 367 à laquelle on pourra se reporter. Il comprend un conduit d'admission 1 muni d'une entrée d'air 2 et d'un système classique d'introduction du mélange primaire (non représenté).The carburetor shown, of the inverted type, has a general constitution similar to that described in patent publication FR 2 391 367 to which reference may be made. It comprises an intake duct 1 provided with an air inlet 2 and with a conventional system for introducing the primary mixture (not shown).

Le dispositif de départ comprend un volet excentré 3 monté sur un axe 4, en amont dudit système (le sens de circulation étant indiqué par une flèche), et actionné par le courant d'air aspiré par le carburateur contre l'action d'un premier organe thermostatique 5 qui tend à fermer le volet quand la température d'un élément qui s'échauffe en même temps que le moteur est inférieure à une limite donnée.The starting device comprises an eccentric flap 3 mounted on an axis 4, upstream of said system (the direction of circulation being indicated by an arrow), and actuated by the current of air sucked in by the carburetor against the action of a first thermostatic member 5 which tends to close the shutter when the temperature of an element which heats up at the same time as the motor is below a given limit.

Dans la pratique, l'organe 5 pourra être prévu pour ne plus exercer des efforts appréciables sur le volet dans le sens de la fermeture dès que la température de l'eau de refroidissement du moteur dépasse 65°C. Cet organe est en général une spirale bimétallique, qui ne peut exercer qu'un effort faible.In practice, the member 5 may be provided so as to no longer exert appreciable forces on the shutter in the closing direction as soon as the temperature of the engine cooling water exceeds 65 ° C. This organ is generally a bimetallic spiral, which can exert only a weak effort.

L'organe d'étranglement usuel 6 du carburateur est constitué par un papillon monté sur un axe 7 en aval du système d'introduction et actionné par le conducteur. Lorsque le conducteur n'exerce aucune action sur la commande d'accélération, l'organe d'étranglement 6 revient à sa position d'ouverture minimum, déterminée par une came de ralenti accéléré 8. La came 8 représentée est munie de gradins 8a d'appui d'une vis de butée 10 réglable, portée par un levier 11 calé sur l'axe rotatif 12 et relié par une tringle 13 à un levier 14 solidaire de l'axe 7 du papillon 6.The usual throttling member 6 of the carburetor is constituted by a butterfly mounted on an axis 7 downstream of the introduction system and actuated by the driver. When the driver exerts no action on the acceleration control, the throttle member 6 returns to its minimum open position, determined by an accelerated idle cam 8. The cam 8 shown is provided with steps 8a d support of an adjustable stop screw 10, carried by a lever 11 fixed on the rotary axis 12 and connected by a rod 13 to a lever 14 secured to the axis 7 of the butterfly 6.

La came 8 tourne librement sur une douille fixe (non visible sur la figure) à l'intérieur de laquelle passe librement un axe 16. La douille est emmanchée dans un boîtier contenant le premier organe thermostatique 5 et fermé par un couvercle supportant une résistance électrique reliée au circuit d'allumage du moteur de façon à chauffer l'organe thermostatique 5 dès que le moteur tourne. L'organe thermostatique 5 peut être réchauffé par tout autre moyen, comme par exemple l'eau de refroidissement du moteur. L'extrémité de l'axe 16 situé dans le boîtier est fixée à un levier 20 recourbé à ses extrémités 20a et 20b suivant la direction de l'axe 16. L'extrémité 20a constitue un doigt auquel est accrochée l'extrémité mobile de l'élément thermostatique 5 et sera entraînée par cette extrémité.The cam 8 rotates freely on a fixed socket (not visible in the figure) inside which a pin 16 passes freely. The socket is fitted in a housing containing the first thermostatic member 5 and closed by a cover supporting an electrical resistance connected to the ignition circuit of the engine so as to heat the thermostatic member 5 as soon as the engine is running. The thermostatic member 5 can be heated by any other means, such as for example the engine cooling water. The end of the axis 16 located in the housing is fixed to a lever 20 bent at its ends 20a and 20b in the direction of the axis 16. The end 20a constitutes a finger to which the movable end of the thermostatic element 5 and will be driven by this end.

Un levier 22 est fixé par un écrou 21 à l'autre extrémité de l'axe 16, éloignée du levier 20. Le levier 22 est relié par une tringle 23 à un levier 24 solidaire de l'axe 4 du volet 3.A lever 22 is fixed by a nut 21 at the other end of the axis 16, distant from the lever 20. The lever 22 is connected by a rod 23 to a lever 24 secured to the axis 4 of the shutter 3.

Un second organe thermostatique 9 est également constitué par une spirale bimétallique dont l'extrémité externe 9a est enroulée autour d'un ergot 25 solidaire de la came 8. Cette extrémité 9a est ainsi ancrée sur la came 8 et entraîne cette came dans le sens de rotation des aiguilles d'une montre lorsque l'organe 9 se refroidit, dans le sens contraire lorsqu'il se réchauffe.A second thermostatic member 9 is also constituted by a bimetallic spiral, the external end 9a of which is wound around a lug 25 integral with the cam 8. This end 9a is thus anchored on the cam 8 and drives this cam in the direction of clockwise rotation when the member 9 cools, in the opposite direction when it heats.

L'extrémité interne de la spirale bimétallique 9 est fixée sur l'axe 16 solidaire du levier 20.The internal end of the bimetallic spiral 9 is fixed on the axis 16 integral with the lever 20.

Le levier 22 possède un doigt 27 pouvant coopérer par butée avec l'ergot 25 de la came 8 pour limiter le mouvement angulaire que le second organe thermostatique 9 tend à imposer à la came 8 lorsque sa température diminue. Le levier 11 possède une extrémité 11 a recourbée perpendiculairement au plan de l'ensemble du levier 11. Cette extrémité 11 a est propre à coopérer par butée avec une partie 22a du levier 22. Lorsque le conducteur ouvre l'organe d'étranglement ou papillon 6, le levier 11 tourne dans le sens des aiguilles d'une montre autour de l'axe 12 et son extrémité 11 vient buter contre la partie 22a et impose une ouverture minimale au volet 3.The lever 22 has a finger 27 which can cooperate by abutment with the lug 25 of the cam 8 to limit the angular movement that the second thermostatic member 9 tends to impose on the cam 8 when its temperature decreases. The lever 11 has one end 11 a bent perpendicular to the plane of the assembly of the lever 11. This end 11 a is adapted to cooperate by abutment with a part 22a of the lever 22. When the driver opens the throttle member or butterfly 6, the lever 11 rotates clockwise around the axis 12 and its end 11 abuts against the part 22a and imposes a minimum opening on the flap 3.

Des moyens pneumatiques, prévus pour commander l'ouverture du volet 3 lorsque la dépression dans le conduit d'admission 1 augmente, comprennent un élément pneumatique D muni d'une tige 34.Pneumatic means, provided for controlling the opening of the shutter 3 when the vacuum in the intake duct 1 increases, comprise a pneumatic element D provided with a rod 34.

La tige 34 comporte une échancrure e limitée, du côté éloigné de l'élément D, par une arête 34a perpendiculaire à la direction longitudinale de la tige 34. L'extrémité 20b du levier 20 se loge dans l'échancrure e de telle sorte que l'arête 34a peut coopérer par butée avec cette extrémité 20b.The rod 34 has a notch e limited, on the side remote from the element D, by an edge 34a perpendicular to the longitudinal direction of the rod 34. The end 20b of the lever 20 is housed in the notch e so that the edge 34a can cooperate by abutment with this end 20b.

L'extrémité 34b de la tige 34 porte une vis 36 servant de butée réglable, propre à coopérer par l'intermédiaire de sa partie terminale 36a avec les gradins 8b de la came 8 pour limiter l'ouverture commandée du volet 3.The end 34b of the rod 34 carries a screw 36 serving as an adjustable stop, suitable for cooperating via its terminal part 36a with the steps 8b of the cam 8 to limit the controlled opening of the shutter 3.

Le déplacement de la tige mobile 34 de l'élément pneumatique D vers la droite de la figure, sous l'effet de la dépression régnant dans le conduit d'admission en aval de l'organe d'étranglement 6, est contrarié, au-delà d'une position déterminée, par un ressort 40. Ce ressort 40 entoure une partie 41 de la tige 34 de diamètre réduit par rapport au reste de la tige; il est précomprimé entre, d'une part, l'extrémité 34b de la tige 34 et, d'autre part, une pièce d'appui annulaire 42 pouvant coulisser le long de la partie cylindrique 41 de la tige 34 et qu'il tend à appliquer contre un épaulement 44 de ladite tige 34. L'anneau 42 a un diamètre externe supérieur à la plus grande dimension d'un passage ménagé pour loger la tige 34 à l'intérieur d'un bossage du corps du carburateur. Ainsi, dès que la tige 34 s'est déplacée d'une longueur supérieure à une valeur déterminée à partir de sa position de repos, la pièce annulaire 42 vient en contact avec la face terminale 43 du bossage du corps du carburateur et forme appui fixe.The movement of the movable rod 34 of the pneumatic element D to the right of the figure, under the effect of the vacuum prevailing in the intake duct downstream of the throttle member 6, is thwarted, au- beyond a determined position, by a spring 40. This spring 40 surrounds a part 41 of the rod 34 of reduced diameter relative to the rest of the rod; it is precompressed between, on the one hand, the end 34b of the rod 34 and, on the other hand, an annular support piece 42 which can slide along the cylindrical part 41 of the rod 34 and which it tends to apply against a shoulder 44 of said rod 34. The ring 42 has an external diameter greater than the largest dimension of a passage formed to accommodate the rod 34 inside a boss of the carburetor body. Thus, as soon as the rod 34 has moved a length greater than a value determined from its rest position, the annular part 42 comes into contact with the end face 43 of the boss of the carburetor body and forms a fixed support. .

L'élément pneumatique D du carburateur montré sur la figure, à titre d'exemple de mise en oeuvre de l'invention, comprend deux parois mobiles constituées par des membranes 51 et 56 placées dans un boîtier 50. La première membrane 51 est attelée directement à la tige 34. Cette membrane 51 sépare une chambre 52, maintenue à la pression atmosphérique, d'une chambre 53 reliée, par un canal 54, à un orifice 55 débouchant dans le conduit 1 en un point qui passe d'aval en amont de la tranche du papillon 6 lorsqu'on entr'ouvre celui-ci à partir de sa position de ralenti accéléré. Ce point pourra être placé immédiatement en aval de la position prise par le papillon 6 lorsque la vis 36 repose sur le gradin 8b le plus haut de la came 8. En effet, comme on le verra plus loin, l'élément pneumatique D permet de maintenir une assistance pneumatique d'ouverture du volet 3 lorsque cette position est dépassée.The pneumatic element D of the carburetor shown in the figure, by way of example of implementation of the invention, comprises two movable walls constituted by membranes 51 and 56 placed in a housing 50. The first membrane 51 is directly coupled to the rod 34. This membrane 51 separates a chamber 52, maintained at atmospheric pressure, from a chamber 53 connected, by a channel 54, to an orifice 55 opening into the conduit 1 at a point which passes from downstream to upstream of the edge of the throttle valve 6 when the latter is opened from its accelerated idle position. This point could be placed immediately downstream of the position taken by the butterfly 6 when the screw 36 rests on the highest step 8b of the cam 8. In fact, as will be seen below, the pneumatic element D makes it possible to maintain a pneumatic assistance for opening the shutter 3 when this position is exceeded.

La seconde membrane 56 sépare la chambre 53 d'une chambre 57 reliée à un point 58 du conduit 1 situé en permanence en aval du papillon 6, par un canal 59. Elle est liée à la membrane 51 par une liaison mécanique présentant un jeu j. La liaison illustrée est constituée par une tige 60 attelée à la membrane 56 et dont l'extrémité épanouie 61 est maintenue à l'intérieur d'un étrier 62 solidaire de la membrane 51, étrier dans lequel elle peut se déplacer entre deux positions de butée 63 et 64. On donne au jeu j la valeur la plus faible possible pour laquelle la durée de libération de la came 8, lors de l'ouverture du papillon 6 depuis le ralenti jusqu'à une position d'ouverture partielle suffit pour que cette came prenne une position d'équilibre sous l'action de la spirale bimétallique 5. Ce jeu j dépendra dans une certaine mesure du volume de la chambre 53 et de la section de passage offerte par le conduit 54. Il ne dépassera pas 1 mm en général; sa valeur sera typiquement de quelques dixièmes de millimètre.The second membrane 56 separates the chamber 53 from a chamber 57 connected to a point 58 of the conduit 1 located permanently downstream of the butterfly 6, by a channel 59. It is linked to the membrane 51 by a mechanical connection having a clearance j . The illustrated link is constituted by a rod 60 coupled to the membrane 56 and whose open end 61 is held inside a stirrup 62 secured to the membrane 51, stirrup in which it can move between two stop positions 63 and 64. The clearance j is given the lowest possible value for which the duration of release of the cam 8, when the throttle 6 is opened from idle to a partially open position is sufficient for this cam takes an equilibrium position under the action of the bimetallic spiral 5. This clearance j will depend to a certain extent on the volume of the chamber 53 and on the passage section offered by the conduit 54. It will not exceed 1 mm in general; its value will typically be a few tenths of a millimeter.

Enfin, un ressort 65 disposé dans la chambre 57 tend à refouler la membrane 56 vers la gauche de la gigure.Finally, a spring 65 disposed in the chamber 57 tends to push the membrane 56 to the left of the figure.

En suite de quoi on a le fonctionnement suivant:

  • Après lancement du moteur froid, les différents éléments ont la position montrée sur la figure: le papillon 6 est dans une position de ralenti accéléré, imposée par l'un des gradins 8a de la came 8. La membrane 56 est soumise sur ses deux faces à la même dépression qui règne dans le conduit 1 en aval du papillon 6, transmise aux chambres 53 et 57 respectivement par les conduits 54 et 59: elle n'a donc aucune action motrice.
Following which we have the following operation:
  • After launching the cold engine, the different elements have the position shown in the figure: the butterfly 6 is in an accelerated idle position, imposed by one of the steps 8a of the cam 8. The membrane 56 is subjected on its two faces at the same depression which prevails in the conduit 1 downstream of the butterfly 6, transmitted to the chambers 53 and 57 respectively by the conduits 54 and 59: it therefore has no motive action.

Par contre, la membrane 51, soumise sur une face à la pression atmosphérique et sur l'autre face à la dépression régnant dans le conduit 1 en aval du papillon 6, tire la tige 34 vers la droite de la figure, maintenant ainsi la partie terminale 36a de la vis 36 en butée sur un gradin 8b de la camé 8, contre l'effort du ressort 40; la partie terminale épanouie 61 de la tige 60 est maintenue en appui sur la face de butée 63 à l'intérieur de l'étrier 62, par l'effort du ressort 65, de raideur très inférieure à la raideur du ressort 40. Lorsque le moteur s'est réchauffé, on désire dégager la vis 36 de la came 8 de façon que cette dernière prenne la position correspondant à son nouvel état thermique: pour atteindre ce résultat, il suffira d'entr'ouvrir légèrement le papillon 6 jusqu'à faire passer l'orifice 55 en amont de la tranche du papillon 6. La pression dans la chambre 53 devient alors sensiblement égale à la pression atmosphérique. La membrane 51, soumise à la même pression sur ses deux faces, perd son action motrice; la membrane 56, soumise à la forte dépression de la chambre 57 et à la faible dépression de la chambre 53, se déplace vers la droite de la figure contre l'effort du ressort 65, amène la partie terminale épanouie 61 de la tige 60 en appui sur la face de butée 64 à l'intérieur de l'étrier 62 et prend le relais de la membran 51 dans l'assistance pneumatique assurant l'ouverture partielle du volet 3.On the other hand, the membrane 51, subjected on one side to atmospheric pressure and on the other face to the depression prevailing in the conduit 1 downstream of the butterfly 6, pulls the rod 34 to the right of the figure, thus maintaining the part terminal 36a of the screw 36 in abutment on a step 8b of the cam 8, against the force of the spring 40; the open end portion 61 of the rod 60 is held in abutment on the abutment face 63 inside the stirrup 62, by the force of the spring 65, of stiffness much less than the stiffness of the spring 40. When the engine has warmed up, we want to release the screw 36 from the cam 8 so that the latter takes the position corresponding to its new thermal state: to achieve this result, it will suffice to slightly open the butterfly valve 6 until passing the orifice 55 upstream of the edge of the butterfly 6. The pressure in the chamber 53 then becomes substantially equal to atmospheric pressure. The membrane 51, subjected to the same pressure on its two faces, loses its motor action; the membrane 56, subjected to the high depression of the chamber 57 and to the low depression of the chamber 53, moves to the right of the figure against the force of the spring 65, brings the open end portion 61 of the rod 60 into support on the abutment face 64 inside the stirrup 62 and takes over from the membrane 51 in the pneumatic assistance ensuring the partial opening of the flap 3.

Dans le laps de temps pendant lequel la partie terminale 61 de la tige 60 passe de l'appui sur la face 63 à l'appui sur la face 64 de l'étrier 62, la tige 34 est soumise au seul effort du ressort 40, effort qui déplace ladite tige 34 vers la gauche de la figure et dégage la partie terminale 36a de la vis 36 des gradins 8b de la came 8 qui pourra ainsi prendre la position correspondant à l'état thermique de la spirale bimétallique. En effet, la came 8 n'est plus retenue, la vis 10 ayant été dégagée des gradins 8a par l'ouverture légère du papillon. Dès que le nouvel état des pressions se sera établi dans les différentes chambres de l'élément pneumatique D, la membrane 56, devenue à son tour motrice, ramènera la vis 36 en butée sur un nouveau gradin 8b de la came 8.In the period of time during which the terminal part 61 of the rod 60 passes from the support on the face 63 to the support on the face 64 of the stirrup 62, the rod 34 is subjected to the sole force of the spring 40, force which moves said rod 34 to the left of the figure and releases the terminal part 36a of the screw 36 of the steps 8b of the cam 8 which can thus take the position corresponding to the thermal state of the bimetallic spiral. Indeed, the cam 8 is no longer retained, the screw 10 having been released from the steps 8a by the slight opening of the butterfly. As soon as the new state of the pressures is established in the different chambers of the pneumatic element D, the membrane 56, which in turn becomes driving, will bring the screw 36 into abutment on a new step 8b of the cam 8.

Le laps de temps correspondant à l'établissement du nouvel état des pressions dans l'élément D devra être suffisamment long pour que la came 8 se dégage. Pour cela, il suffit soit que l'on entr'ouvre relativement lentement le papillon 6, soit qu'un calibreur de faible section soit interposé sur le conduit 54.The period of time corresponding to the establishment of the new state of pressures in element D must be long enough for cam 8 to be released. To do this, it suffices either that the butterfly valve 6 is opened relatively slowly, or that a calibrator of small section is interposed on the conduit 54.

On voit que l'on obtient bien ainsi le dégagement de la came de ralenti accéléré dans de très bonnes conditions, puisqu'il n n'est plus nécessaire comme auparavant d'avoir une ouverture de papillon brutale et importante pour faire remonter la pression agissant sur la commande pneumatique d'ouverture de volet.We see that we thus obtain the release of the accelerated idle cam in very good conditions, since it is no longer necessary as before to have a brutal and significant throttle opening for raise the pressure acting on the pneumatic shutter opening control.

Claims (7)

1. Carburetor comprising: a starting device having an unbalanced flap (3) located in the air intake of the carburetor, upstream of the opening of a system for introducing a primary air/fuel mixture, said flap being actuated by the airflow drawn by the carburetor against the action of a first thermostatic member (5) which biases the flap toward closure when the temperature is lower than a given limit; a fast idle cam (8) suitable for cooperation with a second thermostatic member (9), for partially opening the driver controlled throttle member (6) when the starting flap (3) is closed, at least partially; pneumatic means (D) responsive to the vacuum which prevails in the induction passage (1) of the carburetor and whose movement controls opening of the flap (3) when the degree of vacuum increases; and stop means (8b) having several positions, responsive to the ambient temperature and which limit, to an extent which is variable as a function of the position they take, displacement of the pneumatic means, characterized in that the pneumatic means (D) comprise two movable walls (51, 56) connected to each other by a bidirectional connection comprising a determined clearance (j), wherein the first wall (51), which directly cooperates with the stop means (8b), is effective when the throttle member (6) does not exceed the idling position while the second wall (56) is effective when the throttle member is beyond that position.
2. Carburetor according to claim 1, characterized in that the pneumatic means are provided with a first return spring (65) continuously acting on the second wall (56) and with a second spring (40) acting on the first wall (51).
3. Carburetor according to claim 2, characterized in that the second return spring (40) increases the return force only when the extent of movement of the pneumatic means (D) under the action of the vacuum which prevails in the induction passage exceeds a determined amplitude from its normal position.
4. Carburetor according to claim 1, 2 or 3, characterized in that the two movable walls define a chamber (53) connected to a point (55) of the induction passage which is located immediately downstream of the location of the edge of the throttle member (6) when the latter is in the fast idle position corresponding to the lowest temperature for which the carburetor is designed.
5. Carburetor according to claim 4, characterized in that the second wall (56) separates said chamber (53) from an additional chamber (57) connected by a channel to a point (58) of the induction passage which is continuously located downstream of the throttle member.
6. Carburetor according to claim 4 or 5, characterized in that the connection between the first chamber (53) and the induction passage is provided with a calibrator of low cross-sectional flow area.
7. Carburetor according to anyone of the preceding claims, characterized in that the clearance (j) is lower than 1 mm.
EP19800401604 1979-11-23 1980-11-07 Carburettor comprising a choke valve Expired EP0029769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7928999A FR2470254A1 (en) 1979-11-23 1979-11-23 IMPROVEMENTS ON CARBURETORS INCLUDING A FLAP STARTING DEVICE
FR7928999 1979-11-23

Publications (2)

Publication Number Publication Date
EP0029769A1 EP0029769A1 (en) 1981-06-03
EP0029769B1 true EP0029769B1 (en) 1983-05-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401604 Expired EP0029769B1 (en) 1979-11-23 1980-11-07 Carburettor comprising a choke valve

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EP (1) EP0029769B1 (en)
JP (1) JPS5683538A (en)
DE (1) DE3062983D1 (en)
FR (1) FR2470254A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3606983A (en) * 1969-04-21 1971-09-21 Holley Carburetor Co Carburetor having an automatic choke
FR2194234A5 (en) * 1972-07-31 1974-02-22 Sibe
FR2239594A2 (en) * 1973-07-31 1975-02-28 Sibe Carburettor with eccentric starting butterfly - air flow is sucked in against thermostat controlled closing action
FR2391367A2 (en) * 1977-05-18 1978-12-15 Sibe CARBURETTOR DEVELOPMENTS INCLUDING A STARTING DEVICE
JPS53148626A (en) * 1977-05-31 1978-12-25 Toyota Motor Corp Choke breaker for carburetor for internal combustion engine

Also Published As

Publication number Publication date
EP0029769A1 (en) 1981-06-03
FR2470254B1 (en) 1981-12-11
FR2470254A1 (en) 1981-05-29
JPS5683538A (en) 1981-07-08
DE3062983D1 (en) 1983-06-09

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